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110
C
HAPTER
6: T
ROUBLESHOOTING
How many computers on the LAN does the Router support?
A maximum of 253 computers on the LAN are supported.
How many wireless clients does the Cable/DSL Router support?
A maximum of 128 wireless clients are supported.
There are only 4 LAN ports on the Router. How are additional
computers connected?
You can expand the number of connections available on your LAN
by using hubs, switches and wireless access points connected to
the Router. 3Com wireless access points and OfficeConnect hubs
and switches provide a simple, reliable means of expanding your
network; contact your supplier for more information, or visit:
Does the Router support virtual private networks (VPNs)?
The Router supports VPN passthrough, which allows VPN clients on
the LAN to communicate with VPN hosts on the Internet. It is also
possible to set up VPN hosts on your LAN that clients elsewhere on
the Internet can connect to, but this is not a recommended
configuration.
Where can I download software updates for the Router?
Updates to the Router software are posted on the 3Com support
web site, accessible by visiting:
What other online resources are there?
The 3Com Knowledgebase at:
is a database of technical information covering all 3Com products.
It is updated daily with information from 3Com technical support
services, and it is available 24 hours a day, 7 days a week.
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A
U
SING
D
ISCOVERY
Running the
Discovery
Application
3Com provides a user friendly Discovery application for detecting the
Router on the network.
Windows Installation
(95/98/2000/Me/NT)
1
Insert the Router CD-ROM in the CD-ROM drive on your computer. A
menu will appear; select
Router Discovery
.
Discovery will find the Router even if it is unconfigured or misconfigured.
Discovery Welcome Screen
2
When the
Welcome
screen is displayed click on
Next
and wait until the
application discovers the Routers connected to your LAN.
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PPENDIX
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ISCOVERY
3
Highlight the
Cable/DSL Router
by clicking on it, and press
Next
.
4
Click on
Finish
to launch a web browser and display the login page for
the Router.
Discovered Finish
!
Screen
Discovered Router Screen
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B
IP A
DDRESSING
The Internet
Protocol Suite
The Internet protocol suite consists of a well-defined set of
communications protocols and several standard application protocols.
Transmission Control Protocol/Internet Protocol (TCP/IP) is probably the
most widely known and is a combination of two of the protocols (IP and
TCP) working together. TCP/IP is an internationally adopted and
supported networking standard that provides connectivity between
equipment from many vendors over a wide variety of networking
technologies.
Managing the
Router over the
Network
To manage a device over the network, the Router must be correctly
configured with the following IP information:
An IP address
A Subnet Mask
IP Addresses and
Subnet Masks
Each device on your network must have a unique IP address to operate
correctly. An IP address identifies the address of the device to which data
is being sent and the address of the destination network. IP addresses
have the format n.n.n.x where n is a decimal number between 0 and 255
and x is a number between 1 and 254 inclusive.
However, an IP Address alone is not enough to make your device operate.
In addition to the IP address, you need to set a subnet mask. All networks
are divided into smaller sub-networks and a subnet mask is a number
that enables a device to identify the sub-network to which it is
connected.
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DDRESSING
For your network to work correctly, all devices on the network must have:
The same sub-network address.
The same subnet mask.
The only value that will be different is the specific host device number.
This value must always be unique.
An example IP address is ‘192.168.100.8’. However, the size of the
network determines the structure of this IP Address. In using the Router,
you will probably only encounter two types of IP Address and subnet
mask structures.
Type One
In a small network, the IP address of ‘192.168.100.8’ is split into two
parts:
Part one (‘192.168.100’) identifies the network on which the device
resides.
Part two (‘.8’) identifies the device within the network.
This type of IP Address operates on a subnet mask of ‘255.255.255.0’.
See an example about how a network with three computers and a Router
might be configured.
Table 4
IP Addressing and Subnet Masking
Type Two
In larger networks, where there are more devices, the IP address of
‘192.168.100.8’ is, again, split into two parts but is structured differently:
Part one (‘192.168’) identifies the network on which the device
resides.
Part two (‘.100.8’) identifies the device within the network.
Device
IP Address
Subnet Mask
PC 1
192.168.100.8
255.255.255.0
PC 2
192.168.100.33
255.255.255.0
PC 3
192.168.100.188
255.255.255.0
Router
192.168.100.72
255.255.255.0

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